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2.21.9  Transform arcsin into arctan : asin2atan

asin2atan takes as argument an expression containing inverse trigonometric functions.
asin2atan replaces arcsin(x) by arctan(x/√1−x2), in this expression.
Input :

asin2atan(asin(x))

Output :

atan(x/sqrt(1-x^2))

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